Form URL-encoded to JSON converter
Paste a request body from browser developer tools to see the data as the server receives it in $_POST or params.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter request body and repeated names without brackets.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
The body is decoded first (+ is a space, %XX are UTF-8 bytes), then each name is split into parts: user[address][city] becomes a nested path and items[] appends a new item. A group whose keys are 0, 1, 2 in order becomes a JSON array, anything else an object.
Example
Inputs: Repeated names without brackets = Last value wins (PHP). Result: JSON: { "name": "Ali Hassan", "email": "ali@example.com", "address": { "city": "Riyadh", "zip": "12211" }, "items": [ "pen", "book" ] }; Fields: 6.
name=Ali+Hassan&email=ali%40example.com&address%5Bcity%5D=Riyadh&address%5Bzip%5D=12211&items%5B%5D=pen&items%5B%5D=book
{
"name": "Ali Hassan",
"email": "ali@example.com",
"address": {
"city": "Riyadh",
"zip": "12211"
},
"items": [
"pen",
"book"
]
}Limits and caveats
- Values stay strings because a form carries no types.
- Dots and spaces in names are not turned into _ the way PHP does in $_POST.
Questions about this tool
How is this different from the query string converter?
This one builds nested data from brackets as PHP and Rails do; the query string tool lists parameters as they are without reading brackets.
What happens when a name without brackets repeats?
By default the last value wins, as in PHP, and you can choose to collect the values into an array.
Where do I copy the request body from?
From the Network tab in developer tools: pick the request, open Payload and click view source to get the encoded text.